ramips: add support for Edimax BR-6478AC v2

Roll-up of patches by Rohan Murch, Hans Ulli Kroll, and James McKenzie.
Taken from https://forum.openwrt.org/viewtopic.php?id=67192 and updated.

Specification:
- System-On-Chip: MT7620A
- CPU/Speed: 580 MHz
- Flash-Chip: Macronix MX25L6405D
- Flash size: 8192 KiB
- RAM: 64 MiB
- Wireless No1: SoC-integrated: MT7620A 2.4GHz 802.11bgn
- Wireless No2: On-board chip: MT7612E 5GHz 802.11ac
- Switch: Mediatek MT7530W Gigabit Switch
- USB: Yes 1 x 2.0

Installation:
1. Download sysupgrade.bin
2. Open vendor web interface
3. Choose to upgrade firmware
4. After reboot connect via ethernet at 192.168.1.1

Signed-off-by: Daniel Gimpelevich <daniel@gimpelevich.san-francisco.ca.us>

1 files changed, 215 insertions, 0 deletions

diff --git a/target/linux/ramips/dts/BR-6478AC-V2.dts b/target/linux/ramips/dts/BR-6478AC-V2.dts
new file mode 100644
index 0000000000..fb2b3ce41e
--- /dev/null
+++ b/target/linux/ramips/dts/BR-6478AC-V2.dts
@@ -0,0 +1,215 @@
+/*
+ * Device Tree file for the Edimax BR-6478AC V2
+ * based on Linksys E1700
+ *
+ * Copyright (C) 2016 Rohan Murch <rohan.murch@gmail.com>
+ * Copyright (C) 2016 Hans Ulli Kroll <ulli.kroll@googlemail.com>
+ * Copyright (C) 2017 James McKenzie <openwrt@madingley.org>
+ *
+ * This file is licensed under the terms of the GNU General Public
+ * License version 2.  This program is licensed "as is" without any
+ * warranty of any kind, whether express or implied.
+ */
+
+/dts-v1/;
+
+/include/ "mt7620a.dtsi"
+
+#include <dt-bindings/gpio/gpio.h>
+#include <dt-bindings/input/input.h>
+
+/ {
+	compatible = "edimax,br-6478ac-v2", "ralink,mt7620a-soc";
+	model = "Edimax BR-6478AC v2";
+
+	aliases {
+		led-status = &led_power;
+	};
+
+	chosen {
+		bootargs = "console=ttyS0,57600";
+	};
+
+	gpio-keys-polled {
+		compatible = "gpio-keys-polled";
+		#address-cells = <1>;
+		#size-cells = <0>;
+		poll-interval = <20>;
+
+		reset_wps {
+			label = "reset_wps";
+			gpios = <&gpio0 2 GPIO_ACTIVE_LOW>;
+			linux,code = <KEY_RESTART>;
+		};
+	};
+
+	gpio-leds {
+		compatible = "gpio-leds";
+
+		led_power: power {
+			label = "br-6478ac-v2:white:power";
+			gpios = <&gpio0 11 GPIO_ACTIVE_LOW>;
+		};
+		wan {
+			label = "br-6478ac-v2:blue:wan";
+			gpios = <&gpio0 7 GPIO_ACTIVE_LOW>;
+		};
+		wlan {
+			label = "br-6478ac-v2:blue:wlan";
+			gpios = <&gpio0 10 GPIO_ACTIVE_LOW>;
+		};
+		usb {
+			label = "br-6478ac-v2:blue:usb";
+			gpios = <&gpio0 14 GPIO_ACTIVE_LOW>;
+		};
+	};
+
+
+	gpio_export {
+		compatible = "gpio-export";
+		#size-cells = <0>;
+		usb-power {
+			gpio-export,name="usb-power";
+			gpio-export,output=<1>;
+			gpios = <&gpio2 5 GPIO_ACTIVE_HIGH>;  /* pin45 */
+		};
+	};
+};
+
+
+&gpio2 {
+	status = "okay";
+};
+
+
+&spi0 {
+	status = "okay";
+
+	m25p80@0 {
+		#address-cells = <1>;
+		#size-cells = <1>;
+		compatible = "jedec,spi-nor";
+		reg = <0 0>;
+		linux,modalias = "m25p80", "mx25l6405d";
+		spi-max-frequency = <10000000>;
+
+		partition@0 {
+			label = "u-boot";
+			reg = <0x0 0x30000>;
+			read-only;
+		};
+
+		partition@30000 {
+			label = "u-boot-env";
+			reg = <0x30000 0x10000>;
+			read-only;
+		};
+
+		factory: partition@40000 {
+			label = "factory";
+			reg = <0x40000 0x10000>;
+			read-only;
+		};
+
+		partition@50000 {
+			label = "cimage";
+			reg = <0x50000 0x20000>;
+			read-only;
+		};
+
+		partition@70000 {
+			label = "firmware";
+			reg = <0x00070000 0x00790000>;
+		};
+	};
+};
+
+&pinctrl {
+	state_default: pinctrl0 {
+		gpio {
+			ralink,group = "i2c", "uartf", "wdt", "pa",
+					"ephy", "nd_sd", "wled";
+			ralink,function = "gpio";
+		};
+	};
+};
+
+&ethernet {
+	status = "okay";
+	mtd-mac-address = <&factory 0x4>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&rgmii1_pins &rgmii2_pins &mdio_pins>;
+	mediatek,portmap = "wllll";
+
+	port@5 {
+		status = "okay";
+		mediatek,fixed-link = <1000 1 1 1>;
+		phy-mode = "rgmii";
+	};
+
+	mdio-bus {
+		status = "okay";
+
+		phy0: ethernet-phy@0 {
+			reg = <0>;
+			phy-mode = "rgmii";
+		};
+
+		phy1: ethernet-phy@1 {
+			reg = <1>;
+			phy-mode = "rgmii";
+		};
+
+		phy2: ethernet-phy@2 {
+			reg = <2>;
+			phy-mode = "rgmii";
+		};
+
+		phy3: ethernet-phy@3 {
+			reg = <3>;
+			phy-mode = "rgmii";
+		};
+
+		phy4: ethernet-phy@4 {
+			reg = <4>;
+			phy-mode = "rgmii";
+		};
+
+		phy1f: ethernet-phy@1f {
+			reg = <0x1f>;
+			phy-mode = "rgmii";
+		};
+	};
+};
+
+&gsw {
+	mediatek,port4 = "gmac";
+	mediatek,mt7530 = <1>;
+};
+
+
+&wmac {
+	ralink,mtd-eeprom = <&factory 0>;
+};
+
+&pcie {
+	status = "okay";
+
+	pcie-bridge {
+		mt76@0,0 {
+			reg = <0x0000 0 0 0 0>;
+			device_type = "pci";
+			mediatek,mtd-eeprom = <&factory 0x8000>;
+			mediatek,2ghz = <0>;
+		};
+	};
+
+};
+
+&ehci {
+	status = "okay";
+};
+
+&ohci {
+	status = "okay";
+};